package cn.itcast.hotel.service.impl;

import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {
    @Autowired
    public RestHighLevelClient client;
    @Override
    public PageResult search(RequestParams params) throws IOException {
        //创建搜索请求
        SearchRequest request = new SearchRequest("hotel");
//        //创建查询条件
//        String key = params.getKey();
//        if(key==null||"".equals(key)){
//            request.source().query(QueryBuilders.matchAllQuery());
//        }else{
//            request.source().query(QueryBuilders.matchQuery("all",key));
//        }
        //将查询条件封装成一个函数
        buildBasicQuery(params,request);

        //分页
        int page=params.getPage();
        int size=params.getSize();
        request.source().from((page-1)*size).size(size);

        //距离排序
        String location = params.getLocation();
        if (location != null && !location.equals("")) {
            request.source().sort(SortBuilders
                    .geoDistanceSort("location", new GeoPoint(location))
                    .order(SortOrder.ASC)
                    .unit(DistanceUnit.KILOMETERS)
            );
        }

        //发送请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);

        //总条数
        long total = response.getHits().getTotalHits().value;
        SearchHit[] hits = response.getHits().getHits();
        List<HotelDoc> hotels=new ArrayList<>();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);
            //获取排序值
            Object[] sortValues = hit.getSortValues();
            if (sortValues.length>0){
                Object sortValue = sortValues[0];
                hotelDoc.setDistance(sortValue);
            }
            hotels.add(hotelDoc);
        }
        return new PageResult(total,hotels);
    }

    private void buildBasicQuery(RequestParams params, SearchRequest request) {
        //1、构建BoolQueryBuilder
        BoolQueryBuilder boolQuery=QueryBuilders.boolQuery();
        //2、关键字搜索
        String key = params.getKey();
        if(key==null||"".equals(key)){
            boolQuery.must(QueryBuilders.matchAllQuery());
        }
        else{
            boolQuery.must(QueryBuilders.matchQuery("all",key));
        }
        // 3.城市条件
        if (params.getCity() != null && !params.getCity().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));
        }
        // 4.品牌条件
        if (params.getBrand() != null && !params.getBrand().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));
        }
        // 5.星级条件
        if (params.getStarName() != null && !params.getStarName().equals("")) {
            boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));
        }
        // 6.价格
        if (params.getMinPrice() != null && params.getMaxPrice() != null) {
            boolQuery.filter(QueryBuilders
                    .rangeQuery("price")
                    .gte(params.getMinPrice())
                    .lte(params.getMaxPrice())
            );
        }

        //算分控制（广告置顶）
        FunctionScoreQueryBuilder functionScoreQuery =
                QueryBuilders.functionScoreQuery(
                // 原始查询，相关性算分的查询
                        boolQuery,
    // function score的数组
                        new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{
                                // 其中的一个function score 元素
                                new FunctionScoreQueryBuilder.FilterFunctionBuilder(
                                        // 过滤条件
                                        QueryBuilders.termQuery("isAD", true),
                                        // 算分函数
                                        ScoreFunctionBuilders.weightFactorFunction(10)
                                )
                        });
        request.source().query(functionScoreQuery);
    }


}
